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Before the 1980s,chlorofluorocarbons (CFCs) were primarily used as ____.
Q6: One approach to preserving open space,used in
Q11: A community knows the effects of chemical
Q12: Groundwater is primarily stored in underground _.<br>A)
Q22: The atmospheric layer containing 75% of the
Q30: Natural and synthetic chemicals in the environment
Q33: Which state has made the best use
Q40: Scientists fear the dead zone in the
Q41: Rocks can be converted from one type
Q68: Conventional natural gas is often found in
Q74: One-fifth of all the freshwater in the